Nostoc interbryum Sant’Anna et al. (2007: 96) (Fig. 11D–H).

Colonies macroscopically blackish, round to elongated, or amorphous microscopic colonies, 30.06–87.54 μm wide. Trichomes moniliform, densely to sparsely arranged in colonies, flexuous, not branched. Sheath conspicuous, firm, non-lamellated, hyaline to brown. Cells spherical or sub-quadratic, 2.19–9.86 µm wide. Apical cell rounded. Cell content homogenous or slight granulated, blue-green. Heterocyte spherical, semielliptical (2.84) 3.55–5.69 µm wide, brown, basal or intercalary position. Akinetes spherical or irregular in mature colonies, 4.11–5.69 μm diam.

Habitat: —Tree bark; associated with Hassallia sp. and Gloeocapsa sp.2 .

Studied material: — PEUFR55785, PEUFR55786, PEUFR55797, PEUFR56647